linux-kernel - Re: [RFC] fs, proc: Introduce the /proc/<pid>/map

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Date:	Thu, 25 Aug 2011 21:07:05 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Vasiliy Kulikov <segoon@...nwall.com>,
	Nathan Lynch <ntl@...ox.com>,
	Oren Laadan <orenl@...columbia.edu>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-kernel@...r.kernel.org,
	James Bottomley <jbottomley@...allels.com>,
	LINUXFS-ML <linux-fsdevel@...r.kernel.org>,
	containers@...ts.osdl.org, Zan Lynx <zlynx@....org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC] fs, proc: Introduce the /proc/<pid>/map_files/ directory v2

On Thu, Aug 25, 2011 at 07:01:47PM +0200, Tejun Heo wrote:
> Hello,
> 
> On Thu, Aug 25, 2011 at 12:29:44PM +0400, Cyrill Gorcunov wrote:
> >  | lr-x------ 1 cyrill cyrill 64 Aug  9 15:25 0x3d73a00000 -> /lib64/ld-2.5.so
> >  | lr-x------ 1 cyrill cyrill 64 Aug  9 15:25 0x3d73c1b000 -> /lib64/ld-2.5.so
> >  | lr-x------ 1 cyrill cyrill 64 Aug  9 15:25 0x3d73c1c000 -> /lib64/ld-2.5.so
> >  | lr-x------ 1 cyrill cyrill 64 Aug  9 15:25 0x3d73e00000 -> /lib64/libc-2.5.so
> >  | lr-x------ 1 cyrill cyrill 64 Aug  9 15:25 0x3d73f4e000 -> /lib64/libc-2.5.so
> 
> I would prefer if the filename included both start and end addresses
> so that it matches the first column of /proc/PID/maps and ls'ing the
> directory is more useful.  What do other people think?
> 

This will force us to bloat proc_inode a bit more, since at moment we
have a union such as

struct proc_inode {
	struct pid *pid;
	union {
		int fd;
		unsigned long vm_start;
	};
	...

also it will require to make a buffer for names twice bigger as well.
If all this not a problem -- then sure we can do that ;)

	Cyrill
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